Question

1. In an AP if a = 21, d = -3 and an = 0 then the value of n is ​

Answer 1

a=21

d= -3

an=0

a+(n-1)d=0

21+(n-1)(-3)=0

21-3n+3=0

-3n+24=0

-3n= -24

n= -24/-3

n=8

8th term if AP is 0

Answer 2

Answer:

n is also equal to -3

Step-by-step explanation:

a=21

d=-3

n=?

21 n=21*-3

21 n=-63

n=-63/21

n=-3